A377730 - cp's OEIS frontend

A377730 Number of integers less than n that have the same greatest prime factor as n.

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	1
7	0
8	2
9	2
10	1
11	0
12	3
13	0
14	1
15	2
16	3
17	0
18	4
19	0
20	3
21	2
22	1
23	0
24	5
25	4
26	1
27	6
28	3
29	0
30	5
31	0
32	4
33	2
34	1
35	4
36	7
37	0
38	1
39	2
40	6
41	0
42	5
43	0
44	3
45	7
46	1
47	0
48	8
49	6
50	8
51	2
52	3
53	0
54	9
55	4
56	7
57	2
58	1
59	0
60	9
61	0
62	1
63	8
64	5
65	4
66	5
67	0
68	3
69	2
70	9
71	0
72	10
73	0
74	1
75	10
76	3
77	6
78	5
79	0
80	11
81	11
82	1
83	0
84	10
85	4
86	1
87	2
88	7
89	0
90	12

[0, 0, 0, 1, 0, 1, 0, 2, 2, 1, 0, 3, 0, 1, 2, 3, 0, 4, 0, 3, 2, 1, 0, 5, 4, 1, 6, 3, 0, 5, 0, 4, 2, 1, 4, 7, 0, 1, 2, 6, 0, 5, 0, 3, 7, 1, 0, 8, 6, 8, 2, 3, 0, 9, 4, 7, 2, 1, 0, 9, 0, 1, 8, 5, 4, 5, 0, 3, 2, 9, 0, 10, 0, 1, 10, 3, 6, 5, 0, 11, 11, 1, 0, 10, 4, 1, 2, 7, 0, 12]

cp's OEIS Frontend

A377730 Number of integers less than n that have the same greatest prime factor as n.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	1
7	0
8	2
9	2
10	1
11	0
12	3
13	0
14	1
15	2
16	3
17	0
18	4
19	0
20	3
21	2
22	1
23	0
24	5
25	4
26	1
27	6
28	3
29	0
30	5
31	0
32	4
33	2
34	1
35	4
36	7
37	0
38	1
39	2
40	6
41	0
42	5
43	0
44	3
45	7
46	1
47	0
48	8
49	6
50	8
51	2
52	3
53	0
54	9
55	4
56	7
57	2
58	1
59	0
60	9
61	0
62	1
63	8
64	5
65	4
66	5
67	0
68	3
69	2
70	9
71	0
72	10
73	0
74	1
75	10
76	3
77	6
78	5
79	0
80	11
81	11
82	1
83	0
84	10
85	4
86	1
87	2
88	7
89	0
90	12

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	1
7	0
8	2
9	2
10	1
11	0
12	3
13	0
14	1
15	2
16	3
17	0
18	4
19	0
20	3
21	2
22	1
23	0
24	5
25	4
26	1
27	6
28	3
29	0
30	5
31	0
32	4
33	2
34	1
35	4
36	7
37	0
38	1
39	2
40	6
41	0
42	5
43	0
44	3
45	7
46	1
47	0
48	8
49	6
50	8
51	2
52	3
53	0
54	9
55	4
56	7
57	2
58	1
59	0
60	9
61	0
62	1
63	8
64	5
65	4
66	5
67	0
68	3
69	2
70	9
71	0
72	10
73	0
74	1
75	10
76	3
77	6
78	5
79	0
80	11
81	11
82	1
83	0
84	10
85	4
86	1
87	2
88	7
89	0
90	12

n	a(n)
1	0
2	0
3	0
4	1
5	0
6	1
7	0
8	2
9	2
10	1
11	0
12	3
13	0
14	1
15	2
16	3
17	0
18	4
19	0
20	3
21	2
22	1
23	0
24	5
25	4
26	1
27	6
28	3
29	0
30	5
31	0
32	4
33	2
34	1
35	4
36	7
37	0
38	1
39	2
40	6
41	0
42	5
43	0
44	3
45	7
46	1
47	0
48	8
49	6
50	8
51	2
52	3
53	0
54	9
55	4
56	7
57	2
58	1
59	0
60	9
61	0
62	1
63	8
64	5
65	4
66	5
67	0
68	3
69	2
70	9
71	0
72	10
73	0
74	1
75	10
76	3
77	6
78	5
79	0
80	11
81	11
82	1
83	0
84	10
85	4
86	1
87	2
88	7
89	0
90	12